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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26620b6e26b22218aba3fae1b40353dcfa15e70a1b50b3688bc5c8feb259cf96' 
  AND token = 'HN5Kn8BWrIh8r17SdVJBSnXvnIv5AKdDZt1XKs20ZU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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