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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52c850c28d3d9db738f98531b7764773d089c96106fe6cf1f3b63a99aabae2d' 
  AND token = 'tk1BpSOJWmlGNM203cTQnsiPlawWw8hMzL1gBU06nCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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