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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd539de12924125fcac21ccb1e849437dedd31a309532003102e5eb371a453303' 
  AND token = 'p5Yz/+4rGbItji0sekrP2EHp47M+eGniWLVXkOswCmA=' 
  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"
    }
  }
}