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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c78dac92e82d891628a3ad0c2901dcf7a68679f3eb426003e2dbae9c66d813' 
  AND token = 'kE7DyzgO/fX+N8SXWCZtEZhzhPlurCQRx8V/gQmjNng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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