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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed6d20c545be6586b4767030e04accce5f3ff529ab006375bd20bc25bcfd144' 
  AND token = 'MutXzb+Xzsov7fdt5OR/BZ+ESjpfcvHCag/bV9yYN0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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