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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8ac30a1d7664d0a77cbbce5dede0bc10140f73a0c1f578677e1b627bd70ba5' 
  AND token = 'FKEB400LydYqnkIspZdy3Ug6e5ys6H0hjyjyw/DF/nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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