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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bf99e81ceafa1cb21b6080049ed7c0d81f956f3c5a437ae212f68801dee6e0' 
  AND token = 'VnUhBihIF7GY2NC+HEe3oySAIxISjHcgO4/nq+ew+7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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