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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bcfbf31d1432ef5a290364b725f7b31f7f244cb280f09f9d50c49d940e402f' 
  AND token = '9+CLH+QLpLVsQIbBmrG+Rgi7TrX1AMmkStgQKXOs4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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