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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b8bb0e870ed7484f22e2e58e0f0ff170450a596b458ef7a90fc1f302d187c2' 
  AND token = '68cO6zkf8ykB0Aw/UZfuf9lb4hiatW1A70WdphA58OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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