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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366a221129da3691a52089f74d6841adeeebd1008afdfc4b1ab26a73714b0ae7' 
  AND token = 'lXneI57flFr3laMdlRChsXjP+P8F8IHkg+nT9teGDtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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