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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4587d8db2fb54702427d18e15cd3dbb8711b4471bcb473eed5e76b51342d3e5' 
  AND token = 'NW3uOdDgPNRBGCgy7FggX/xc5JvzIl3lEAuV+XuIN2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}