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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06ee57c3dc048b2a1613890521981f6366cddbf7e9c6914cecddaf9ab33ea40' 
  AND token = 'U3rMbudbRNTx6A/sQT0MOk3MfBUo8CJQxMbUTMRpXjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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