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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a93d61bb158b14ecd31ff31ba5fa7ea402f690385f0209210c77dc7fc309572' 
  AND token = '5VPmZ3IikUZEVNHygVnp+40lwRsjQBxXNt5qae5PC3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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