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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890aa213fbc2d5eb782021209005a88e3296cd9d0561d863a00ff68d5af6d8d0' 
  AND token = '/XPRezxV2VK80K0AU7PnAnkO+kDvZ4/LIQyKCEkHWjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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