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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b660575a9be9346b9ec136e6372ac43e4a5bc0c0c5855cf8be75710f2807a344' 
  AND token = 'PSdsrRiE8IEEk7soMcsk/kPR68wConnjEPA/qaBkbzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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