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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d98589f40a868fb7c9e750b16050dfeeaeb51bb6d3ff4f76267bd880c1cbd2' 
  AND token = 'MbiKonpLb9DPj7o1ai1gmFUFPKVIV8jgxxgkfXX8fjk=' 
  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"
    }
  }
}