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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9550a78969ebccad16059f41537ed4aa5702688b1622ce71ccfa5c67a8d82c' 
  AND token = 'flrMt0XHCL4PwiB8fDlNbf+uvGq5LY4slm0Sg+E3LNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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