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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5b43641859577a3b7c50a1a60c855a5203fa8475667470bd43212e6473fbbc' 
  AND token = 'xKiaJCL6ypAGiTfBC4ZKxx2EIBOBIShLDbxTToc1vUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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