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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13130d563d1a56378f7022f46139eddbff7d01817e951b0e4456b2df55d6d4c' 
  AND token = 'XzYiYvb9nOe+B7Sp8GTH7y+1U81yUiRKOkcaBKNNrmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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