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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4946f6e3b926e13ad66da48c0b01bad591417b1a85d5fdf4725c29d095422d80' 
  AND token = 'XNAsNnhIMTKjUqDM+JW8+QA/odXV99/Gy5FU02zc1WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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