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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cf34b6ef7e315e7e041e8b63d7cfc3d963ba1e0a395fc2cead45171faaa57f' 
  AND token = 'rn9ESUSXG+KRT502iN77PD/wPI6p9VMekg/3qgR6k2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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