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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3531848d8ec5b0c559d3f80b8af8bfb119723c765d151cee0ad048b9732d3b33' 
  AND token = 'L/2ig0BR4tEIp4aOpHOZ/JEmYP/lueM1YLUInxHiZ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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