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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56f4b861b115a491926b7bc4a329cea4e7b455598ebe61eb2de63e77778c315' 
  AND token = '/cxRcAp+1I/s2nPq62BKRU7RQYRVlyCpQ7KvgKrortg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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