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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fa2e9fac4c6d0cd2f84f7e39d42b4024ad98ba19a4d501376fbb302340491b' 
  AND token = '8iu5RKJpH8Tm2ovYqxYM8zV/2n+73imZ3AAL6xfDNJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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