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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee06e3a8b426273aa9ef15ef549d8243ee54f383a94e39d60f90380c2eec205' 
  AND token = 'hGUznSuy6L8OEQbD66FVZ3173O4cVCl/nLRNsPBb27k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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