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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58b9a3cc28c143983f161b5371d1ea6da50bb494e63b2f903a03753eabddb41' 
  AND token = '/naRIf5dxeQNIvdzn/TsGWSaHwRfopEqwFG+9AonNMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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