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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91bcde8790661f399002ed6707d6f1c5343353b7b31b9254b9b7f81979f482f' 
  AND token = 'GDE+32uvCNrrQ2ORIWXwG+dt6Stdp2ymSf+FOO3Pk+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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