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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd1ad15fdfca343e633d647fcb5d98358e93a0751d26f4d758d717246ff6bcd' 
  AND token = '3oF2mPv5hUNQPgXrI07ogX5kHVwBT/4X3MfYMDzUVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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