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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cc62253f5756044f0399437443e22cfe17caac3142bdef2414835f8c2489e3' 
  AND token = '1MMwSug8XlIq7uFF1OwqP+MHfr8MtjX4n4gXTP/02mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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