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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6412522e7f17ce59e81646b7bd97e98946e43541a41158a5de29244c5a2bd949' 
  AND token = '+xyqJBvpoF8Ei8v3wSyq1ce0N998eeinOgq6O69IpKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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