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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6617b171c634d89ce3b343bb7584065b71ccbfa9dbd158886737b9a656be59' 
  AND token = '9eLoEGNlWQoNwHgh8UO5Qftm8LAaA3xYa91dJbcwqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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