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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d494a15018e1224ac9166a9e11901d2872c53928555948f103d3cb59e26d38' 
  AND token = 'G9NPDMnRFsBz/wdtd+vO8HuV59yhUK2NVn4NguRRVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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