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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5942621ec9e4634fb2fcd2006426a854637da492f2c9cdd4874623ba2d4ee6b' 
  AND token = 'uJCqDWzhiezxXyqDxy3x4IbN+GFlwnc9bgVIgtEpLxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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