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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9ef33413a9c328fe4e242a861dda53e374c3f5d3c7dda8c82e1e8e743a5918' 
  AND token = 'pfwvAhG+/uJWOcEt8ebFedQy9YEjJVJ0InFcuvksvRg=' 
  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"
    }
  }
}