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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abca8b9812f81e9211aaa5c7b69def9b49e9f18792edd5ced7c8e2e6abeee90' 
  AND token = 'TrJSciPrJiEB4+Qp0XCUvf+FRfuEr5F/nmyB5mbhOuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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