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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec372ac35d207d025ce1f2cb3e1a7b9b144c5503307c3425a5b15ad84ded4e56' 
  AND token = 'UQlJP9UlXxPBF8ZEsJqYZc8E2o/M6521gfHgMgp8d0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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