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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c425a336ddff5a2cdd6db5a02d5a6eeff15b1bc5d36a31b5e7d23d91ffe69c8d' 
  AND token = 'XxLQaGGQ9Ull44EI0+ztQu84wotTc79eqjo65hDVM9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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