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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47a60e2e2a3f271afb4493fb76585a494990df59558c7bea000d412a675dfb8' 
  AND token = 'FWZ3A0BN+obD+AABH9wJWTbv3q3QNV5gOQ9kObCVU98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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