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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93f2b82c84f1828f02ca1a3f6ced2116fee2682f6f0e7b3fad1bd46693d08a6' 
  AND token = 'sz8u7NNs6KzpArNiBtP108dw4HML4zcJqpRyX/om6Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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